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Showing 1-30 of 35 results for "358665" within Papers
Noelia Luque et al.
Journal of chromatography. A, 1248, 74-83 (2012-06-26)
The suitability of a mixed-mode sorbent made up of admicelles of sodium dodecyl sulphate (SDS) and tetrabutylammonium (TBA) to extract and preserve pesticides from river and underground water was assessed. Pesticides belonging to different structural groups (i.e. triazines, carbamates, phenylureas
Jacek Cieślak et al.
Current protocols in nucleic acid chemistry, Chapter 4, Unit4-Unit4 (2012-09-08)
The conversion of 3',5'-disilylated 2'-O-(methylthiomethyl)ribonucleosides to 2'-O-(phthalimidooxymethyl)ribonucleosides is achieved in yields of 66% to 94%. Desilylation and dephtalimidation of these ribonucleosides by treatment with NH(4)F in MeOH produce 2'-O-aminooxymethylated ribonucleosides, which are efficient in producing stable and yet reversible 2'-conjugates
Purnandhu Bose et al.
Chemistry, an Asian journal, 7(10), 2373-2380 (2012-07-26)
A new series of tris(2-aminoethyl)amine (tren)-based L-alanine amino acid backboned tripodal hexaamide receptors (L1-L5) with various attached moieties based on electron-withdrawing fluoro groups and lipophilicity have been synthesized and characterized. Detailed binding studies of L1-L5 with different anions, such as
Rosa M Suárez et al.
Molecules (Basel, Switzerland), 17(8), 8735-8741 (2012-07-27)
The synthesis of 9,9'-[1,2-ethanediylbis(oxymethylene)]bis-2-amino-1,9-dihydro-6H-purin-6-one, a minor impurity of acyclovir, is described. Starting with commercial N-(9-acetyl-6-oxo-1H-purin-2-yl)acetamide, the process uses an acid catalysed phase transfer catalysis (PTC) process to produce the selective alkylation at the 9 position of the guanine ring.
Chao Zhong et al.
Carbohydrate polymers, 94(1), 38-45 (2013-04-03)
In this article, a novel and high efficient solvent, tetra-n-Butylammonium Hydroxide (TBAH), was used for dissolution and isolation of straw cellulose from wheat straw. The composition analysis with gas chromatography (GC) and the spectroscopic characterization analysis conducted by X-Ray diffraction
Y B Zhou et al.
Water science and technology : a journal of the International Association on Water Pollution Research, 66(4), 810-815 (2012-07-07)
Removal of phenanthrene (PHE) from aqueous solution by adsorption onto quaternary ammonium surfactant modified peat was studied. The results show that surfactant modification enhanced the PHE adsorption capacity of peat. Low temperature and neutral pH favored PHE adsorption. Peat modified
Ya-Wen Chang et al.
Physical review letters, 108(24), 247802-247802 (2012-09-26)
The phase behavior of charged disk suspensions displays a strong dependence on ionic strengths, as the interplay between excluded volume and electrostatic interactions determines the formation of glasses, gels, and liquid crystal states. The various ions in natural soil or
Ye Rin Choi et al.
Chemical communications (Cambridge, England), 48(83), 10346-10348 (2012-09-18)
A series of synthetic molecules bearing the same hydrogen bonding mode observed in StClC were prepared and their transport ability of chloride ion across a lipid membrane was systematically optimized.
Toshihiro Kimura et al.
Inorganic chemistry, 51(23), 13001-13008 (2012-11-15)
A simple monomeric tungstate, TBA(2)[WO(4)] (I, TBA = tetra-n-butylammonium), could act as an efficient homogeneous catalyst for chemical fixation of CO(2) with 2-aminobenzonitriles to quinazoline-2,4(1H,3H)-diones. Various kinds of structurally diverse 2-aminobenzonitriles could be converted into the corresponding quinazoline-2,4(1H,3H)-diones in high
David J Posson et al.
Nature structural & molecular biology, 20(2), 159-166 (2012-12-25)
Understanding how ion channels open and close their pores is crucial for comprehending their physiological roles. We used intracellular quaternary ammonium blockers, electrophysiology and X-ray crystallography to locate the voltage-dependent gate in MthK potassium channels from Methanobacterium thermoautotrophicum. Blockers bind
Shintaro Itagaki et al.
Chemical communications (Cambridge, England), 48(74), 9269-9271 (2012-08-10)
In the presence of Rh(2)(OAc)(4) (OAc = acetate) and TBA(2)WO(4) (TBA = tetra-n-butylammonium), the N-silylation of indole derivatives with hydrosilanes efficiently proceeded to give the corresponding N-silylated indoles in high yields. Pyrrole and carbazole were also N-silylated with the combined
Mary Y Ryan et al.
Channels (Austin, Tex.), 6(6), 443-452 (2012-10-16)
RNA editing at four sites in eag, a Drosophila voltage-gated potassium channel, results in the substitution of amino acids into the final protein product that are not encoded by the genome. These sites and the editing alterations introduced are K467R
Kosei Sugahara et al.
Chemical communications (Cambridge, England), 48(67), 8422-8424 (2012-07-14)
A tetra-n-butylammonium (TBA) salt of a γ-Keggin -6-charged germanodecatungstate, [γ-H(2)GeW(10)O(36)](6-) (I), could act as an efficient homogeneous catalyst for Knoevenagel condensation of active methylene compounds with carbonyl compounds.
Zhenfeng He et al.
Dalton transactions (Cambridge, England : 2003), 41(33), 10043-10051 (2012-05-29)
A new kind of organic-inorganic hybrid complexes based on polyoxometalate were synthesized through symmetrically grafting two adeninyl groups onto Anderson-type MnMo(6) clusters and encapsulating the clusters by organic surfactants. The resultant complexes exhibited thermal-induced dynamic self-assembly behaviors which greatly depended
Colorimetric detection of cyanide with a chromogenic oxazine
Tomasulo M and Raymo FM
Organic Letters, 7(21), 4633-4636 (2005)
Shohei Sakashita et al.
Organic letters, 15(17), 4308-4311 (2013-08-21)
Palladium-catalyzed Suzuki-Miyaura cross-coupling reactions of tetrabutylammonium 2-pyridyltriolborate salts with various aryl (heteroaryl) chlorides can produce the corresponding desired coupling products with good to excellent yields. These tetrabutylammonium salts are more reactive than the corresponding lithium salts. The coupling reactions with
Michelle L Ingalsbe et al.
Bioorganic & medicinal chemistry letters, 19(17), 4984-4987 (2009-08-08)
Due to the increasing number of strains of drug-resistant bacteria, the development of new antibiotics has become increasingly important. The antibacterial properties of quaternary amines and their derivatives on both Gram-positive and Gram-negative bacteria are well known. However, an encompassing
Hiroyuki Nakao et al.
Biochimica et biophysica acta, 1848(1 Pt A), 145-150 (2014-10-15)
KcsA is a pH-dependent potassium channel that is activated at acidic pH. The channel undergoes global conformational changes upon activation. We hypothesized that the open-close conformational changes of the transmem brane region could promote the flip-flop of phosphoiipids. Based on
Muhammet Uyanik et al.
Science (New York, N.Y.), 345(6194), 291-294 (2014-07-19)
The diverse biological activities of tocopherols and their analogs have inspired considerable interest in the development of routes for their efficient asymmetric synthesis. Here, we report that chiral ammonium hypoiodite salts catalyze highly chemo- and enantioselective oxidative cyclization of γ-(2-hydroxyphenyl)ketones
Matt Petrowsky et al.
The journal of physical chemistry. B, 116(33), 10098-10105 (2012-07-31)
Onsager's model of the dielectric constant is used to provide a molecular-level picture of how the dielectric constant affects mass and charge transport in organic liquids and organic liquid electrolytes. Specifically, the molecular and system parameters governing transport are the
Samy Mohamady et al.
Current protocols in nucleic acid chemistry, Chapter 13, Unit13-Unit13 (2012-12-21)
This unit describes a method for preparing nucleoside polyphosphates and their conjugates such as nucleoside triphosphates, symmetrical and unsymmetrical dinucleoside polyphosphates and sugar nucleotides. The protocols employ sulfonyl imidazolium salts (SnISs) as coupling reagents. These reagents are prepared in two
Synthesis, characterization, and DFT/TD-DFT calculations of highly phosphorescent blue light-emitting anionic iridium complexes
Di Censo D, et al.
Inorganic Chemistry, 47(3), 980-989 (2008)
Muhammet Uyanik et al.
Molecules (Basel, Switzerland), 17(7), 8604-8616 (2012-07-20)
We have developed the first example of hypervalent iodine(V)-catalyzed regioselective oxidation of phenols to o-quinones. Various phenols could be oxidized to the corresponding o-quinones in good to excellent yields using catalytic amounts of sodium salts of 2-iodobenzenesulfonic acids (pre-IBSes) and
R Bryan Sears et al.
Journal of inorganic biochemistry, 121, 77-87 (2013-01-29)
The complex cis-[Ru(phpy)(phen)(CH3CN)2](+) (phpy=2-phenylpyridine, phen=1,10-phenanthroline) was investigated as a potential photodynamic therapy (PDT) agent. This complex presents desirable photochemical characteristics including a low energy absorption tail extending into the PDT window (600-850nm) and photoinduced exchange of the CH3CN ligands, generating
A J Chinchalikar et al.
The European physical journal. E, Soft matter, 35(7), 55-55 (2012-07-06)
Clouding is studied by small-angle neutron scattering (SANS) on a charged micellar system of sodium dodecyl sulphate (SDS) and tetrabutylammonium bromide (TBAB) with varying temperature and salt NaCl. We show that the clouding occurs as a result of increase in
Svante Vikingsson et al.
Journal of pharmaceutical and biomedical analysis, 75, 145-152 (2012-12-25)
A high-performance liquid chromatography method capable of measuring thiopurine mono-, di-, and triphosphates separately in red blood cells (RBCs) was developed. RBCs were isolated from whole blood using centrifugation. Proteins were precipitated using dichloromethane and methanol. The thioguanine nucleotides (TGNs)
Anhydrous tetrabutylammonium fluoride
Sun H and DiMagno SG
Journal of the American Chemical Society, 127(7), 2050-2051 (2005)
Oliver Bixner et al.
The Journal of chemical physics, 136(20), 204503-204503 (2012-06-07)
The interaction of exciton and charge transfer (CT) states plays a central role in photo-induced CT processes in chemistry, biology, and physics. In this work, we use a combination of two-dimensional electronic spectroscopy (2D-ES), pump-probe measurements, and quantum chemistry to
Fabio Galeotti et al.
Journal of chromatography. A, 1284, 141-147 (2013-03-05)
In this study, by using tetrabutylammonium bisulfate as ion-pairing reagent, we were able to separate all the main heparin/heparan sulfate disaccharides generated by the action of heparinases along with the main Hep tetrasaccharide possessing a 3-O-sulfate group on the sulfoglucosamine
Erbo Shi et al.
Organic letters, 14(13), 3384-3387 (2012-06-27)
A metal-free C-H oxidation for the construction of allylic esters has been developed. The use of a commercially available and inexpensive catalyst and oxidant, and readily available starting materials, coupled with the operational simplicity of the reaction, renders the methodology
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